content: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2013, by Object Refinery Limited and Contributors.
   *
   * Project Info:  http://www.jfree.org/jfreechart/index.html
   *
   * This library is free software; you can redistribute it and/or modify it
   * under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation; either version 2.1 of the License, or
   * (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
   * License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
   * USA.
   *
   * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
   * Other names may be trademarks of their respective owners.]
   *
   * -------------------------
   * SelectionChangeEvent.java
   * -------------------------
   * (C) Copyright 2013, by Michael Zinsmaier.
   *
   * Original Author:  Michael Zinsmaier;
   * Contributor(s):   -;
   *
   * Changes
   * -------
   * 17-Sep-2013 : Version 1 (MZ);
   *
   */
  
  package org.jfree.data.general;
  
  import java.util.EventObject;
  
  import org.jfree.data.extension.DatasetCursor;
  import org.jfree.data.extension.DatasetSelectionExtension;
  
  /**
   * A change event that notifies about a change to the selection state of data 
   * items.
   */
  public class SelectionChangeEvent<CURSOR extends DatasetCursor> 
          extends EventObject {
       
      /** a generated serial id*/
       private static final long serialVersionUID = 5217307402196957331L;
  
       /**
       * Constructs a new event. 
       *
       * @param source the source of the event aka the selection extension that 
       *     changed (the object has to be of type DatasetSelectionExtension and 
       * must not be null!)
       */
       public SelectionChangeEvent(Object selectionExtension) {
            super(selectionExtension);
       }
  
       /**
        * @return the selection selection extension that triggered the event.
        */
       public DatasetSelectionExtension<CURSOR> getSelectionExtension() {
          if (this.getSource() instanceof DatasetSelectionExtension) {
               return (DatasetSelectionExtension<CURSOR>)this.getSource();
          }
          
          //implementation error
          return null;
      }
  
  }
  